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1202L18

# 1202L18 - 0 1 2 3 4 5 Chapter 53 Population Ecology Know...

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Chapter 53 - Population Ecology 0. Know types of dispersion, and how density estimated (be able to calculate N) 1. Understand both exponential and logistic growth (be able to work problems) 2. Be able to use life table model 3. Understand density dependence 4. Know life history patterns 5. Use human population growth as example Dn/dt = r x N dn/dt=(6x10^-3)(3x10^8)= 18x10^5 R = b-d B= 14/1000 D= 8/1000 R= .014 - .008 = .006 If the pop of the US is 300 mi and 14births and 8 deaths 1000/yr what is the pop growth? 1.800.000 Population Characteristics 0. Population ecology is study of density, dynamics and life history of populations 1. Density is numbers/area estimated from 0. Total counts of plants or sessile animals 1. Mark recapture studies of more mobile animals Mark Recapture Estimates (see Fig. 53.2) 2. If you sample, mark and release, and resample, and marked animals dispersed randomly: 0. No marked in sample 2/ total caught in sample 2 = no. marked in pop. = (no. in S1)/ population size 3. Solving for population size, 0. N = (total in S2)(No. in S1)/No. marked in S2 4. Lets say S1 = 208, S2 = 178, and no in S2 marked = 5 1. Then N = (208)(178)/5 or 7,405 Population Dispersion in Space 6. Populations aggregated or clumped if 1. Organisms are social, or if plants reproduce vegetatively or have poor seed dispersal 7. Populations uniformly dispersed in

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2. Territorial animals 3. Or orchards of trees 8. Populations have a random dispersion if occurrence due to chance Figure 53.4 Patterns of dispersion within a population’s geographic range Population Growth 5. Growth rate = no. of births - no. of deaths 6. r = b - d, r is intrinsic growth rate 7. Change in numbers over time = 29 N / 29 T 8. Model is 29 N / 29 T = r N or dN/dt = rN 4. If r = 0.3 and N = 10, then 3 individuals added next time interval, so N becomes 13 5. If r = 0.3 and N = 100, 30 individuals added, so N becomes 130. Population size increases rapidly, with “J shaped” curve 9.
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